フローインジェクション分析法を応用した冷却水水質管理システム An Application of Flow Injection Analysis to Water Quality Monitoring System
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For an open cooling water system with a zinc-polyphosphate inhibitor, a water quality monitoring system adopted Flow Injection Analysis was introduced. Concentrations of phosphate (inhibitor) and Fe(II) ions were measured automatically by the analytical flow system. Analytical curves for phosphat and Fe(II) ions have good linearity, and their correlation coefficients were 0.9995 and 0.9999, respectively.<br>Reproducibility of measured value for Fe(II) ions was very good and that for phosphate ions was not so good. But these results were satisfactory for practical purposes. When the analytical flow system was applied to on-line monitoring, measured value for phosphate ions have a little amount of scatter. The reason may be explained as follows: 1) the conversion rate of phosphorus forms, during water sample is running through the heated zone, has slightly different at each measurment, and 2) the capability of ascorbic acid as a reducing agent for antimony-phospho-molybdate complex becomes weak with lapse of time. However, this water quality monitoring system has been developed to the point of being usable in practical applications.
Zairyo-to-Kankyo 36(4), 234-238, 1987
Japan Society of Corrosion Engineering